Purification method for preparing ethylene glycol from coal-based synthesis gas

Abstract

The invention relates to the technical field of ethylene glycol production, and provides a purification method for preparing ethylene glycol from coal-based synthesis gas. According to the present invention, ethylene glycol is purified by using a 1# resin tower and a 2# resin tower, the resin filled in the 1# resin tower is SQYJ-2 enhanced ultraviolet resin, and the resin filled in the 2# resin tower is SQYJ-1 dealdehyding catalyst resin; and the SQYJ-2 resin can improve the ultraviolet light transmittance of ethylene glycol and has a slight dealdehyding effect, and the SQYJ-1 resin can reduce the aldehyde content of ethylene glycol. According to the specific condition of the ethylene glycol extracted from the side line of the product tower, the ethylene glycol is selectively introduced into the 1# resin tower or the 2# resin tower, or the ethylene glycol is introduced into the 1# resin tower and then into the 2# resin tower, so that the purification of the ethylene glycol is realized. The ethylene glycol purified by the method disclosed by the invention is high in ultraviolet light transmittance and low in aldehyde content, and can reach the standard of superior products in GB/T4649-2008.

Description

technical field [0001] The invention relates to the technical field of ethylene glycol production, in particular to a purification method for producing ethylene glycol from coal-based synthesis gas. Background technique [0002] Ethylene glycol is a common dihydric alcohol, which can be used to prepare polyester, polyester, plasticizer, surfactant, cosmetics, etc., and can also be used as a solvent for dyes, inks, etc., and to prepare antifreeze for engines. It can be used as a wetting agent for cellophane, fibers, leather, and adhesives, and has a wide range of uses. [0003] At present, the commonly used process for the production of ethylene glycol is the coal-to-gas oxalate hydrogenation process. The ethylene glycol produced by this process will be accompanied by a certain amount of alkaline substances and organic impurities. The product still contains trace amounts of alkaline substances, organic impurities and aldehydes, which affect the UV value (ultraviolet light tr...

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Problems solved by technology

[0003] At present, the commonly used process for the production of ethylene glycol is the coal-to-gas oxalate hydrogenation process. The ethylene glycol produced by this process will be accompanied by a certain amount of alkaline substances and organic impurities. The product still contains trace amounts of alkaline substances, organic impurities and aldehydes, which affect the UV value (ultraviolet light transmittance) of the product

UV value and aldehyde content are important quality standards for ethylene glycol products. However, in the current production process, the UV value and aldehyde content of ethylene glycol are difficult to meet the standards, resulting in product quality indicators that do not meet the national standard for superior products.

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